14 April 2025
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ALEXANDRIA, VA — The Air Conditioning Contractors of America Educational Institute (ACCA-EI) Standards Task Team has issued a new project notification for a proposed addendum to ANSI/ACCA Manual S® – 2023, Residential Equipment Selection.
Manual S®, approved by the American National Standards Institute (ANSI), sets out procedures for selecting residential HVACR equipment based on calculated heating and cooling loads derived from ACCA Manual J®. It details how to apply original equipment manufacturer (OEM) data to ensure systems are appropriately sized for performance, efficiency and comfort.
The proposed Addendum “C” seeks to clarify and correct specific requirements within the normative sections of the current Manual S® document. This follows the approval of Addenda “A” and “B” by ANSI in 2024.
The project has been submitted through ANSI’s Project Initiation Notification System (PINS) and is scheduled to appear in the ANSI Standards Action on Friday, 11 April 2025. The public comment period will run until Sunday, 11 May 2025. A draft version of the proposed addendum is expected to be made available for public review after that date.
Manual S® continues to serve as a key standard for contractors, supporting consistent and professional equipment selection practices across the residential HVACR sector.
Comments or questions can be directed to David Bixby, ACCA’s manager of codes and standards, via email at [email protected].
About ACCA
The Air Conditioning Contractors of America is a leading trade association representing HVACR contractors across the United States. ACCA develops nationally recognised standards and provides training and resources to support quality installation, maintenance and design across heating, air conditioning, refrigeration, home performance and related sectors. For more information, visit acca.org.
